TY  - JOUR
AU  - Engels, Ralf
AU  - Büscher, Markus
AU  - Buske, Paul
AU  - Gan, Yuchen
AU  - Grigoryev, Kirill
AU  - Hanhart, Christoph
AU  - Huxold, Lukas
AU  - Kannis, Chrysovalantis
AU  - Lehrach, Andreas
AU  - Soltner, Helmut
AU  - Verhoeven, Vincent
TI  - Direct observation of transitions between quantum states with energy differences below 10 neV employing a Sona unit
JO  - The European physical journal / D
VL  - 75
IS  - 9
SN  - 1434-6079
CY  - Heidelberg
PB  - Springer
M1  - FZJ-2021-03731
SP  - 257
PY  - 2021
AB  - The direct access to atomic transitions between close by quantum states employing standard spectroscopic methods is often limited by the size of the necessary radio-frequency cavities. Here we report on a new tool for fundamental spectroscopy measurements that can overcome this shortcoming. For this, a Sona transition unit was used, i.e., two opposed solenoidal coils that provide an oscillating field in the rest frame of the through-going atomic beam. In this way, we were able to control the induced photon energy down to 10 neV or f∼ MHz. The tuneable parameter is the velocity of the atomic beam. For illustration of the method, we report a measurement of the hyperfine splitting energies between the substates with F=1 and m_F=−1,0,+1 of 2S_1/2 metastable hydrogen atoms as function of a magnetic field.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000701695300001
DO  - DOI:10.1140/epjd/s10053-021-00268-4
UR  - https://juser.fz-juelich.de/record/897325
ER  -